Map updates can be done, but you have you have to buy the update disc, then pay Porsche to activate and install it. Like anything else Porsche, its ridiculously expensive for what should be a simple thing. Is it worth about $500 to you? Because that is about what you will be looking at when done.
Yeah the stock navigation in my 14 cayman sucks compared to the phone. I have done a few experiments using it. Well it’s gotten me close to where I want to go, but not the whole way. I just use my phone for nav and music, podcasts, Sirius etc wired through the glove box. I have CarPlay in my daily and it’s great, but when I drive the cayman I don’t feel that I need it.
I DO find the $ spent getting a carplay/android auto solution installed worth it. If you plan on using/keeping the car. You say "when I drive the car I don't feel I need it"... but the joys and benefits of having WAZE running... I'd say that alone justifies it
Personally, I'm way too cheap to bother with Android Auto or Car Play. I've played with AA a little on rental cars, and was not impressed. I just use a magnetic vent-mount on the Boxster to hold the phone and I'm happy. I can't stand car-integrated NAV systems, as the interfaces suck and they are often out of date... plus, with Waze, I get so much more info than the car-based ones do anyway.
I usually take the magnetic mount with me on trips so I can use it on rentals or such, as well...